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1 Strzeliński P.

1 2006

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Zastosowanie zdjęć hemisferycznych w badaniach ekosystemów leśnych

Strzeliński P.

Roczniki Geomatyki

2006

T. 4, z. 4

93-112

The main aim of the study is to discuss basic assumptions of taking hemispherical photographs in the context of their practical use in forest inventory. The work encompasses methodology of taking digital hemispherical photographs. Hemispherical photographs are most often taken for research on ecological conditions of plants. Usually the aim of such research is to obtain information on the amount of light which reaches selected height above the ground. It is important to observe a few rules in taking photographs (overcast, camera leveling, sensitivity, shutter speed, maximum resolution). The best equipment for this purpose is a digital reflex camera and fish-eye lens with the angle 180°. Another solution is a digital reflex camera smaller than 35 mm with suitable converter which together with lens will allow to obtain circular photo with retained angle of 180°. Gap Light Analyzer and WinSCANOPY are the most frequently used software packages for analysis of hemispherical photos. The following elements are expected to be determined as a result of analyses based on hemispherical photographs: absolute amount of light registered at measurement levels, crown density structure, spatial variability of stand foliage, leaf area index, general description of crowns (crowns deformation, viability of lateral shoots) the condition of assimilatory organs (number of annuals, crown light and decrement of assimilatory organs, distortion and discoloration of assimilatory organs) relationship between tree density and natural regeneration The following attempts will be undertaken with the use of hemispherical photos: to estimate biomass of assimilatory organs, to estimate density of photons flow in the process of photosynthesis under canopies and in gaps of stand, to register the infrared scope of radiation (in order to examine assimilation organs in stands), to prepare a photomap of canopies. The study encompasses a brief review of literature, a list of possible devices with basic software.